When a sealed, pressurized vessel (say, you) is exposed to a vacuum (say, space), things tend to get splattery—hence the exo-suits. These fifteen examples of atmospheric apparel from our friends at Oobject are the hallmarks of life-support design from the golden age of exploration.

USSR Canine Cosmonaut Space Suit

US XM-2 hypersonic plane, pilot suit

Hypersonic refers to speeds of more than Mach 5. The prototype suit being tested here, in a vacuum chamber full of what are presumably heat lamps was for the X-15 plane.

Spanish high altitude balloon suit, 1935

Polish Wuk-90 Mig Pilot pressure suit

Mounted unworn, it looks like a discarded snake skin.

MX-117 'Tomato Worm' pressure suit developed for USAAF crews in WWII

NASA Apollo, Space Shuttle and 1997 I-suit compared

1977 NASA Hardsuit AX-3 mobility demonstration

Annotated space suit x-ray

US RX2A Suit, by Litton, 1965

Grumman moon suit

Designed for roaming around the moon, the odd bell shape means that the wearer can retract his arms inside the suit. Note the tie.

US high altitude spy plane pressure suit

Worn by SR-71 and U2 pilots

1962 Mercury mission pressure suit

US 1960s Prototype Suit

Orland DM Russian Spacesuit showing life support system

Us 1934 Worlds first pressure suit made for Wiley Post

There were three suits made and only one worked (not this one). The others had a round viewing window, like a diving helmet, rather than this square, welding mask style one.
I've used this image, because I've already used the other on Oobject and incorrectly, as a diving suit. The Wiley Post suit is where the aesthetics of deep sea and high altitude overlap, before they diverged almost completely.